<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>box-sizing</title>
<style type="text/css">
div { width: 200px; height: 70px; padding: 10px; border: 15px solid #999; background: #eee; margin-top: 20px; }
.test {
    -webkit-box-sizing: content-box;
       -moz-box-sizing: content-box;
            box-sizing: content-box;
}
.test2 {
    -webkit-box-sizing: border-box;
       -moz-box-sizing: border-box;
            box-sizing: border-box;
}
</style>
</head>
<body>
<h1>zoom: normal;</h1>
<div class="test">content-box</div>

<h1>zoom: 5;</h1>
<div class="test2">border-box</div>
</body>
</html>
